4212121321 has 2 divisors, whose sum is σ = 4212121322. Its totient is φ = 4212121320.

The previous prime is 4212121313. The next prime is 4212121337. The reversal of 4212121321 is 1231212124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3051015696 + 1161105625 = 55236^2 + 34075^2 .

It is a cyclic number.

It is not a de Polignac number, because 4212121321 - 2³ = 4212121313 is a prime.

It is not a weakly prime, because it can be changed into another prime (4212121351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2106060660 + 2106060661.

It is an arithmetic number, because the mean of its divisors is an integer number (2106060661).

Almost surely, 2^4212121321 is an apocalyptic number.

It is an amenable number.

4212121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

4212121321 is an equidigital number, since it uses as much as digits as its factorization.

4212121321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 4212121321 is about 64900.8576291562. The cubic root of 4212121321 is about 1614.9792890979.

Adding to 4212121321 its reverse (1231212124), we get a palindrome (5443333445).

The spelling of 4212121321 in words is "four billion, two hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".